Solution for Evil Sudoku #2373214695844

8
5
1
2
8
9
3
2
4
1
5
6
4
2
1
3
8
9
5
7
1
5
7
6
4
8
7
5
1
4

This Sudoku Puzzle has 56 steps and it is solved using Naked Single, Full House, Hidden Single, Naked Pair, undefined, Hidden Rectangle techniques.

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Solution Steps:

  1. Row 5 / Column 1 → 7 (Naked Single)
  2. Row 5 / Column 9 → 2 (Naked Single)
  3. Row 5 / Column 5 → 8 (Full House)
  4. Row 2 / Column 1 → 5 (Hidden Single)
  5. Row 4 / Column 7 → 4 (Hidden Single)
  6. Row 9 / Column 8 → 7 (Hidden Single)
  7. Row 6 / Column 6 → 5 (Hidden Single)
  8. Row 6 / Column 3 → 8 (Hidden Single)
  9. Row 1 / Column 2 → 2 (Hidden Single)
  10. Row 1 / Column 1 → 6 (Hidden Single)
  11. Row 1 / Column 7 → 1 (Naked Single)
  12. Row 2 / Column 2 → 4 (Hidden Single)
  13. Row 3 / Column 3 → 1 (Hidden Single)
  14. Row 8 / Column 9 → 1 (Hidden Single)
  15. Row 7 / Column 1 → 1 (Hidden Single)
  16. Naked Pair: 3,9 in r8c18 => r8c4<>3, r8c46<>9
  17. X-Wing: 3 r48 c18 => r7c8<>3
  18. X-Wing: 3 r17 c35 => r39c5,r9c3<>3
  19. Hidden Rectangle: 5/6 in r3c79,r9c79 => r9c9<>6
  20. XY-Chain: 3 3- r4c1 -9- r6c2 -3- r3c2 -9- r2c3 -7- r2c9 -6- r6c9 -3 => r4c8,r6c2<>3
  21. Row 4 / Column 8 → 6 (Naked Single)
  22. Row 6 / Column 9 → 3 (Full House)
  23. Row 6 / Column 2 → 9 (Naked Single)
  24. Row 3 / Column 2 → 3 (Full House)
  25. Row 4 / Column 1 → 3 (Full House)
  26. Row 8 / Column 1 → 9 (Full House)
  27. Row 7 / Column 8 → 9 (Naked Single)
  28. Row 8 / Column 8 → 3 (Full House)
  29. Row 9 / Column 9 → 5 (Naked Single)
  30. Row 1 / Column 3 → 7 (Naked Single)
  31. Row 2 / Column 3 → 9 (Full House)
  32. Row 9 / Column 3 → 2 (Naked Single)
  33. Row 7 / Column 3 → 3 (Full House)
  34. Row 1 / Column 6 → 4 (Naked Single)
  35. Row 1 / Column 5 → 3 (Full House)
  36. Row 9 / Column 7 → 6 (Naked Single)
  37. Row 8 / Column 6 → 8 (Naked Single)
  38. Row 3 / Column 7 → 5 (Naked Single)
  39. Row 9 / Column 5 → 9 (Naked Single)
  40. Row 9 / Column 4 → 3 (Full House)
  41. Row 7 / Column 6 → 6 (Naked Single)
  42. Row 8 / Column 7 → 2 (Naked Single)
  43. Row 7 / Column 7 → 8 (Full House)
  44. Row 7 / Column 5 → 2 (Full House)
  45. Row 8 / Column 4 → 4 (Full House)
  46. Row 2 / Column 6 → 7 (Naked Single)
  47. Row 4 / Column 6 → 9 (Full House)
  48. Row 4 / Column 5 → 7 (Naked Single)
  49. Row 4 / Column 4 → 2 (Full House)
  50. Row 6 / Column 4 → 6 (Naked Single)
  51. Row 6 / Column 5 → 4 (Full House)
  52. Row 3 / Column 5 → 6 (Full House)
  53. Row 2 / Column 9 → 6 (Naked Single)
  54. Row 2 / Column 4 → 8 (Full House)
  55. Row 3 / Column 4 → 9 (Full House)
  56. Row 3 / Column 9 → 7 (Full House)
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